Selvedges forming apparatus

ABSTRACT

A device for carrying out slotted leno healds in the making of selvedges in looms having a movable slide which carries pivoted in it a small plate adapted to cooperate with means in the frame of the device for obtaining a sure deviation of yarns passing through the plate in the respect of fixed needles of the device through which other yarns pass.

United States Patent 1191 Serturini 1111 3,795,261 1 Mar. 5, 1974SELVEDGES FORMING APPARATUS [75] Inventor:

[73] Assignee: Somet SocietaMeceanica Tessile S.p.A., ProvincialValseriana, Italy [22] Filed: June 21, 1972 [21 App]. No.: 264,918 [30]Foreign Application Priority Data Giuseppe Serturini, Gorno, Italy June21,1971 Italy...- ..26138/7I 1521 Us. c1. 139/54 [51] Int. Cl D031!47/40 [58] Field of Search 139/54, 122 S [56] References Cited v UNITEDSTATES PATENTS 2,918,945 12 1959 Hall 139 54 3,227,191 1/1966 Juillard139/54 Primary Examiner-Henry S. Jaudon Attorney, Agent, or FirmYoungand Thompson '57 ABSTRACT A device for carrying out slotted leno healdsin the making of selvedges in looms having a movable slide which carriespivoted in it a small plate adapted to cooperate with means in the frameof the device for obtaining 21 sure deviation of yarns passing throughthe plate in the respect of fixed needles of the device through whichother yarns pass.

7 Claims, 3 Drawing Figures 1 SELVEDGES FORMING APPARATUS BACKGROUND OFTHE INVENTION It is known how selvedges, formed in cloths made onshuttleless looms for the continuous feeding of the weft not providedwith devices for taking in the weft tails, require particular attentionfor the purpose of avoiding frayings and undoings of the selvedgesthemselves. To this purpose one makes suitabletyings with some of theselvedges warp yarns, among which tyings those making use of theso-called slotted leno heald have given particularly good results. Theabove can be applied also to the case of traditional shuttle looms whenthe cloth is prepared to be subjected to intermediate cuttings along itslength, with internal selvedges.

In order to make the selvedges tying by the slotted leno heald the knownart has already provided devices which have given good results which aremounted on suitable loom healds, for instance the first two, and whichsubstantially comprise an elongated frame located vertically in theplane of the healds and comprising means for the connection to the healds, a pair of end transmissions projecting from one side of the frame, apair of needles extending lengthwiseof the frame externally of-the saidside from near the said transmissions to the central zone thereof wherethey end at a short distance from each other with their tipstransversally perforated, thread guide means crossing the frame close tosaid tips and a slide adapted to run lengthwise of the frame crossed bytwo slots raking at 45 with the axis of the frame and forming a rightangle with each other. Such a device is as shown for example I in U.S.Pat. No. 2,918,945.

In the devices of this kind two warp yarns for the selvedges, meant notto cross, are taken by the thread guides to'the end transmissions andfrom the latterto the holes in the needle tips coming from the warp beamand going towards the .cloth being woven, while two other warp yarns,coming and going like the said ones,

merely cross the two raking slots of the slide. The slide,

on the other hand, is mounted with-the possibility of a suitableadjustment of the friction developing between itself and the guides ofthe frame on whic'h it is mounted when it moves from one end to theother of theframe. I I

When theloom is set into motion a relative movement takes place betweenthewarp yarns passing within the'slide. slots and the frame of thedevice for making the slotted leno heald. The slide is thus displaced byreciprocating motion from one end to the other of the frame of thedevice in which itis mounted by the yarns which are within the slots,one on one side and one on the other side of one of the needles. Whenthe slide passes in the zone comprised between the tips of the twoneedles, the yarns displacing it move from one end to the other of therelative slot, each moving to the position in correspondence of theopposite side of the other needle: this takes place provided the fric-,tion between the slide and its guides isconveniently adjusted, that isto say provided said friction is greater than the friction encounteredby the warp yarns'when moving along their slots in the slide. By'saiddisplacement (which is obviously repeated in the opposite direction whenthe slide runs along the framein opposite direction after reversal ofthe motion at the ends) the warp yarns passing through the slide slotsand are crossed tying with the yarns'which are not crossed passingthrough the thread guides the transmissions and the holes of the needletips, in order to realize the slotted leno heald tying.

In addition to the ends of the cloth devices of this kind can also bemounted in correspondence of intermediate healds if selvedges are to beformed within the cloth, such as in the instance when the same is meantfor towels and the like.

The great drawback of such devices lies in the fact that their correctfunctioning depends so much on the perfect adjustment of the frictionbetween the slide and the guides of the frame of the device itself.

It is easy to understand how difficult it is to obtain the said perfectadjustment and how even more difficult it is to maintain it,particularly in looms working at high speed. If the friction falls belowa certain limit the inversion in the position of the yarns with respectto the needles does not take place and the slotted leno heald is notcarried out with the serious drawbacks easy to be imagined, such asuntyings, necessity of darnings, or of stopping the looms. In any casethe interventions for the adjustment of the apparatus and those requiredto remedy the drawbacks due to its adjustment will be rather frequentand not always short with remarkable wastes of time for the' staff incharge and breaks in the production times. It must be added that even ifthe initial adjustment is veryaccurate, it is practically impossible tomaintain a constant or at least correct value of the friction withinrelatively short functioning times, because of the high wear of thereciprocally sliding parts. t

SUMMARY OF THE INVENTION In order to avoid the above mentioned drawback,the

crossed, which plate cooperates with means fixed to the frame of thedevice to cause an oscillation of the smalli a sure deviation of theyarns from one'side to the other plate in its own plane incorrespondence with the passage between the tips of the needles, inorder to obtain of the needles, in the two direetions.- Preferably thesaid means fixed .to the frame consist of a single thread guide, forboth the. warp yarns not to be crossed, projecting from the frame of thedevice and the small plate cooperates with it through an extensionprojecting from the part opposite the one connecting the two holes forthe yarns which are crossed.

BRIEF DESCRIPTION OF THE DRAWING The invention will now be described indetail, by way of nonlimitative example, with reference to the an-'preferred embodiment DESCRIPTION OF THEPREFERRED EMBODIMENT The deviceaccording to the present invention comprises a frame 1 provided with awide prolonged central opening 2 in which there slides a.slide 3. In aknown way it comprises end members 4 for the connection to the healds orheddle bars (not shown), a pair of transmissions 5 with seats 5' for theyarns, a pair of needles 6 ending in tips 7 transversaIly-perforated andspaced apart a short distance in the middle of the frame 1 on the sameside from which the transmissions 5 project.

The general arrangement of the loom and the function of the frame 1 andits associated parts in the loom can be as in the above-identifiedpatent except as noted hereafter. 1

According to the invention the slide -3, which slides within the wideopening 2, carries pivoted on its outer surface a shaped small plate 8made. of plastic material crossed by two holes 9 lined'with metal ringsand having an extension 10 projecting from the side opposite to the oneconnecting the two holes 9. The said extension emerges from the slidewhen the holes 9 are aligned with the axis of the slide and of thedevice frame, but can go back within 'the shape of the slide by makingthe small plate 8 oscillate on its plane around the pivoting point 8.The extension 10 cooperates with a member fixed to the frame 1 which inthe shown embodiment is represented by a thread guide 11 emerging fromthe frame in the form ofa cubic body crossed by a cylindrical hole. I li As is clearly shown in the figures of the annexed drawing, two warpyarns f meant not to cross and coming from the warp beam (not shown)both cross the thread guide 11, wind on the opposite transmissions 5pass through the holes of the tips 7 of the needles 6 and go toward thecloth being woven. Two other selvedges warp yarns F coming from the warpbeam merely pass through the holes 9 of the small plate 8 to directthemselves to the cloth being woven. The frame 1 of the device isvertically mounted on a heald or heddle bar (not shown) of the loom andis moved vertically by the heald when the loom is set into motion. Thereciprocating movements deriving between the yarns F and the frame 1 ofthe device produce the moving of the slide 3 wherein the small plate 8maintains the yarns F one on one side and one on theother side of thecorre-- sponding needle 6. FIGS. 2 and 3 show how, when the slide 3 isbrought to the central zone, of the frame 1, the small plate 8 is madeto oscillate so that in one direction it takes up the position of FIG. 2and in the other yarns to the side of the next needle opposite to thepreceeding one. This takes place in a positive and safe way without anypossibility for mistakes and determines the tying between the yarns Fand the yarns f, thus obtaining the desired formation of the slottedleno heald.

By the described device which of course can also be carried out bymaking use of variations obvious to the experts in the fields withregard to the deviation means causing the oscillation of the small plateand to the shape and structure of the plate itself one avoids all thestops, adjustments, repairs and corrections required by the knowndevices, thus improving remarkably the efficaciousness of the looms andsimplifying their running, especially in the case of highly automatichigh speed looms.

I claim:

I. In selvedge warp control means for a loom having 7 a pair of crossingwarps and a pair of non-crossing warps, a-pair of aligned needles, onefor each noncrossing warp, having their adjacent ends separated by aspace, deflector means for thecrossing warps, and guides fixed withrespect to the needles on which the deflector means is slidable in adirection generally lengthwise of the needles on one side of saidneedles from one side to the other side of said space; the improvementin which said deflector means comprises a slide which slides in saiddirection on said guides, and a plate mounted for pivotal movement onand relative to said slide on the same side of said slide as saidneedles, the plate having two spaced holes therethrough,

each of said crossing warps passing through a different one of saidholes and means causing said plate to pivot between operative positions.

2. Apparatus as claimed in claim 1, said plate being mounted to pivotabout an axis perpendicular to said direction of sliding of saiddeflector means.

3. Apparatus as claimed in claim 2, said holes being disposedsubstantially on opposite sides of said axis.

.4. Apparatus as claimed in claim 1, said means comprising a fixedabutment and said plate having a projection thereon adapted tocontact'said abutment means upon each movement of said slide in eachdirection thereby to pivot said plate. 7

5. Apparatus as claimed in claim 4, in which said abutment meanscomprises a single thread guide for both of said non-crossing warps.

6. Apparatus as claimed in claim 1, in which said holes aresubstantially circular;

7; Apparatus as claimed -in claim 6, in which said plate is of plasticmaterial having a low coefficient of friction and the margins of saidholes are lined with

1. In selvedge warp control means for a loom having a pair of crossingwarps and a pair of non-crossing warps, a pair of aligned needles, onefor each non-crossing warp, having their adjacent ends separated by aspace, deflector means for the crossing warps, and guides fixed withrespect to the needles on which the deflector means is slidable in adirection generally lengthwise of the needles on one side of saidneedles from one side to the other side of said space; the improvementin which said deflector means comprises a slide which slides in saiddirection on said guides, and a plate mounted for pivotal movement onand relative to said slide on the same side of said slide as saidneedles, the plate having two spaced holes therethrough, each of saidcrossing warps passing through a different one of said holes and meanscausing said plate to pivot between operative positions.
 2. Apparatus asclaimed in claim 1, said plate being mounted to pivot about an axisperpendicular to said direction of sliding of said deflector means. 3.Apparatus as Claimed in claim 2, said holes being disposed substantiallyon opposite sides of said axis.
 4. Apparatus as claimed in claim 1, saidmeans comprising a fixed abutment and said plate having a projectionthereon adapted to contact said abutment means upon each movement ofsaid slide in each direction thereby to pivot said plate.
 5. Apparatusas claimed in claim 4, in which said abutment means comprises a singlethread guide for both of said non-crossing warps.
 6. Apparatus asclaimed in claim 1, in which said holes are substantially circular. 7.Apparatus as claimed in claim 6, in which said plate is of plasticmaterial having a low coefficient of friction and the margins of saidholes are lined with metal.